Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd100137addc226ddbb42f7219cc6eb0443a83ab9c644fa2cadd130d3ac5da0ac' 
  AND token = 'UM8YNeCUuQ4H7h4B1M5RBKRArklU/mxUV4m27gTN46M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}